JPH04357136A - Static electricity elimination in optical fiber production line - Google Patents

Abstract

PURPOSE:To provide the title elimination method ensuring favorable winding of an optical fiber on a winding reel while properly maintaining its winding tension. CONSTITUTION:In winding an optical fiber 2 at a winding tension of <=60 gf and a line speed of >=3000m/min, the static electricity charged on the optical fiber 2 is eliminated with a static electricity eliminator 9 on the upstream side of a winding reel 7 to ensure said optical fiber 2 to be wound favorably on the reel 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing static electricity in an optical fiber manufacturing line, and is useful when winding an optical fiber at low tension and high speed.

0002

2. Description of the Related Art There is a coloring machine that applies ink to an optical fiber as a type of optical fiber production line that winds an optical fiber made of quartz glass coated with a resin after being drawn or supplied.

FIG. 5 is an explanatory diagram showing a coloring machine according to the prior art. As shown in the figure, in this coloring machine, an optical fiber 2 fed out from a supply reel 1 is coated with ink by a die 3, cured in an ultraviolet curing oven 4, and then guided to a roll 5 and a capstan roll 6. and is wound onto the take-up reel 7. At this time, near the take-up reel 7, the discharge frequency is a commercial frequency (50 to 60 Hz).
A static eliminator 8 is provided to remove static electricity charged on the optical fiber 2 and the take-up reel 7.

0004

[Problem to be solved by the invention] The optical fiber 2 is
Although it is an insulator made by coating a resin on a quartz glass core and cladding, it is easily charged by friction with rollers on the pass line, wind, etc. The charged optical fiber wire 2 is
As shown in FIG. 6, the body 7a and the collar 7b of the take-up reel 7
A repulsive force or an attractive force acts between the two and the winding becomes disordered. That is, even if the traverse roller 10 is moved in the left-right direction as shown by the arrows in the figure to guide it to a predetermined winding position, the optical fiber 2 does not cause line runout as shown by the dotted line in the figure. This wire runout causes the winding of the optical fiber 2 on the take-up reel 7 to be disordered. As a result, the optical fiber strand 2 wound around the take-up reel 7
Stress is applied to the product, which becomes apparent as an increase in loss during quality inspection, causing problems such as having to be rechecked.

[0005] Furthermore, the position of the traverse turn of the optical fiber strand 2 changes due to the repulsion or attraction force between it and the collar 7b, so that the turn position must be manually adjusted.

[0006] Even if the winding reel 7 is neutralized by the static eliminator 8, if the static electricity of the optical fiber strand 2 just before winding is not removed, winding irregularities will occur. In this case, increasing the winding tension will correct the winding disorder, but if the winding tension is 60gf or more, the stress acting on the optical fiber strand 2 will become excessive, which will become apparent as an increase in loss during quality inspection, and appropriate measures will not be taken. It can't be.

In view of the above-mentioned prior art, the present invention provides a method for eliminating static electricity in an optical fiber manufacturing line that can ensure good winding of optical fiber onto a take-up reel while maintaining proper winding tension. The purpose is to provide law.

[0008]

[Means for Solving the Problems] The structure of the present invention that achieves the above object is as follows:

[0009] After drawing or supplying, the optical fiber wire made of quartz glass coated with resin is wound at a winding tension of 60 gf.
In the manufacturing line for the optical fiber that is wound at a line speed of 300 m/min or more, the optical fiber is electrically charged by a static eliminator installed upstream of the take-up reel along the pass line. It is characterized in that charges are removed at a discharge frequency of 100 Hz or more.

0010

[Function] According to the present invention having the above-described structure, the static electricity charged in the optical fiber strand wound on the take-up reel is removed before winding.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing a coloring machine, which is a type of optical fiber production line that implements an embodiment of the present invention. As shown in the figure, a static eliminator 9 is disposed upstream of the take-up reel 7 along the pass line. The static electricity removal length of this static electricity remover 9 is 50 cm.

In FIG. 1, the same parts as those in FIG. 5 are given the same numbers, and redundant explanations will be omitted.

FIG. 2 is an explanatory diagram showing the principle of a static electricity removal method for removing static electricity charged on the optical fiber 2 by the static electricity remover 9. As shown in FIG. As shown in the figure, optical fiber strand 2
The positive charges charged are neutralized and removed by the blower 11 spraying negative ions generated by the supply of high-voltage AC.

The coloring machine shown in FIG. 1 has a winding tension of 60 gf.
Low tension as below and line speed of 300m/min
Driving at higher speeds. At this time, the static electricity charged on the optical fiber strand 2 wound on the take-up reel 7 is removed by the static eliminator 9 on the upstream side of the take-up reel 7. At this time, the discharge frequency of the static eliminator 9 is set to 100 Hz or more. This is due to the following reason.

[0016] That is, the line speed is 300 m/min.
In the case of such high speeds, if the discharge frequency remains at the commercial frequency, the density of the ions is small and there is a possibility that the ions cannot be tracked. In order to maintain good followability, it is theoretically conceivable to lengthen the static removal length of the static eliminator 9 according to the line speed, but if it exceeds 1 m, it is not practical due to layout restrictions. It disappears.

[0017] Therefore, evaluation was also carried out using a discharge frequency of 10 KHz. The results are shown in FIG. Referring to the same figure, at commercial frequency, the line speed is 300m.
It can be seen that the static voltage that cannot be removed gradually increases when the voltage exceeds /min. This is because the positively charged optical fiber strand 2 passes through the static remover 9 while the static remover 9 is not sufficiently negatively charged. On the other hand, it can be seen that if the discharge frequency is set to 10 KHz, the number of discharges is increased, and the ion density is increased to improve followability, the charged charges can be completely removed even at a line speed of 1000 m/min.

FIG. 4 shows the electrostatic pressure charged on the optical fiber 2 at each part of the pass line of the coloring machine shown in FIG.
In ■, ■, ■, line speed is 300m/min.
The results were measured with and without the static eliminator 9. Referring to the same figure, when the static electricity remover 9 is provided, the static voltage that reaches the peak at the part 2 drops to the same level as the part 2 at the parts 2 and 3. Therefore, in this case, the optical fiber 2 is wound around the take-up reel 7 with the electric charge charged thereon being almost completely removed. On the other hand, it can be seen that when the static eliminator 9 is not provided, the film is wound around the take-up reel 7 while being charged to the same extent as at the peak time.

As is clear from the results shown in FIGS. 3 and 4, according to the method of this embodiment, the electrical charges on the optical fiber wire wound around the take-up reel 7 can be effectively removed.

[0020] The above example was carried out using a coloring machine, but a drawing machine that heats and melts the base material, reduces its diameter, coats it with resin, and winds it up, supplies the optical fiber from a reel and tensions it. The present invention can be similarly applied to a screening machine that winds up after applying a negative force, and a rewinding machine that rewinds from one reel to another.

[0021]

Effects of the Invention As described above in detail with the embodiments, according to the present invention, static electricity can be effectively removed even when low-tension, high-speed winding is required in an optical fiber production line. It is possible to prevent an increase in transmission loss due to disturbances, save the trouble of re-inspecting the winding, and also eliminate the need for manual winding traverse position adjustment to prevent winding disturbances, thus achieving labor savings and cost reductions.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a coloring machine that implements an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the principle of a static electricity removal method for removing static electricity charged on an optical fiber strand.

FIG. 3 is a graph showing the dependence of the static electricity removal effect on the line speed of the static electricity charged on the optical fiber wire.

FIG. 4 is a graph showing the charging characteristics of the optical fiber at each part on the pass line.

FIG. 5 is an explanatory diagram showing a coloring machine according to the prior art.

FIG. 6 is an explanatory diagram showing the state of winding disorder when the optical fiber wire is wound onto the take-up reel.

[Explanation of symbols]

2 Optical fiber wire 7 Take-up reel 9 Static eliminator

Claims (1)

[Claims] Claim 1: After drawing or supplying, a winding tension of 60
In an optical fiber manufacturing line where the optical fiber is wound at a line speed of 300 m/min or less and a line speed of 300 m/min or more, the optical fiber is charged by a static eliminator installed upstream of the take-up reel along the pass line. The electric charge is 100H
A method for removing static electricity in an optical fiber production line, characterized in that static electricity is removed at a discharge frequency of z or more.